... Chipping pieces off Mars . Martian craters with rays may be the long-sought sources for the Mars meteorites found on Earth. ... R esearchers using the Mars Odyssey spacecraft have discovered a handful of small craters on Mars surrounded by far-flung patterns of rays. ... It's fascinating we're seeing ray craters on Mars," Tornabene says, noting the discovery used the THEMIS infrared imager aboard Mars Odyssey. ... Only registered members of Astronomy.com are allowed to comment on this article. ...